RISTOCETIN COFACTOR

General Information

HLAB/HOL Code: VW
UPHSM LIS Test #: 329
Schedule: Daily
Testing Time: 1 day
Testing Lab: UP Health System-Marquette

Specimen Info
Only 1 specimen type required, unless otherwise specified

Volume: 2.0 ml (1.0min plasma)
Temperature: frozen on dry ice
Tube Type: 1 Light-Blue Top (Citrate)
Collection Info:
Spin specimen with a Sure-Sep II or spindown, remove plasma, and spin plasma again. Place plasma in plastic vial and freeze immediately.
A. Sure Sep II or double centrifuging specimens are critical for accurate results as platelet contamination may cause spurious results.

Methods

Platelet aggregation measured turbidimetricly to aid in the diagnosis of Von willebrand disease.

Clinical Utilities

Quantification of Ristocetin cofactor activity in plasma.

CPT Codes

85245

* The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding
is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Reference Range

50 - 200%

Pre-Term-50 - 200%